Improved saw-grinding machine



J. G. BAKER. SAW GRINDING MACHINE. No. 46,843. l Pate nted Mar. 14,1865.

movement may Ntra Sterns Aram* iii-trice,

JOHN G. BAKER, OF PHlLADEbPHIA, PENNSYLVANIA, ASSIGNOR., BYMESNEASSIGNMENTS. TO HENRY DISSTON. OF SAME PLACE yIMFROV'ED SAW-@BINDINGMACHINE.

Specification forming part of Letters Patent No. Whg/i3. dated Marchl-l, 1R65.

To ad whom ib may concern.

v lBe it known thatl, 'JOHN (ln-BAKER, of Philadelphia, Fcnnsylvania,have invented an Imprcvementin Machinery for Grinding Savv- Blades; andIdo hereby declare the following to be a full, clear, and exactdescription In order to enable others skilled inthe art to make and usemy invention, l will now prooecd to describe its construction andoperation.

0n reference tothe accompanying. drawing, which forni a part of thisspecification, Figure 1 is a sectional view of my improved saw-grindingmachine; Fig. 2, a plan View, and Figs. 3, 4, and 5 views of the saw toillust-rate the purport of my invention.

Agrepresents a box-frame or trough, on the upper end of which rests acircular casing, B, incl'osing the greater portion of a disk-Wheel,

C, secured to the shaft D, the latter turning in the opposite sidesvofthe casing, and one end ,of the shaft being furnished with a suitablehand-Wheel, a, or, in place ofthe saine,-a driving-pulley. The casingIB, with its disk- Wheel, is arranged to slide to and fro in guides b b,and is controlled by screws d d, the threads of'which are adapted tointernal threads in lugs e e,projecting from the casing, the screwslturning in the end of the frame A, onl the outside of which each screwis furnished witli a bevel-wheehf, gearing'into a similar- -wheel on theshaft E, which turns in projectionsv F F of the frame, andwhich isfurnished with a hand-Wheel, t'.

" islthe grindstone, and Il its shaft, the ,journals of which turn intheboxes I and l'. One of the latter rests on each side of the boxframe A,to which each'box'is secured by two set-screws, m nea-chI of whichpasses through a slot in thebox sothata limited longitudinal be impartedto the same.

Totherear end of the box I is connected 'aV rod', J, and to the rear endof the box l a similar rod,J, the latter beingjoiuted to on'earm of thelever K and the rod J' to the other arm of the same lever, through'which passes a central pin, '01, secured to the end o f the boxframe A.One end of a link, L, is jointed to the box l', the other-end beingconnected to theshort arm of the bell-crank lever M, .the 'long arm ofwhich has a forked end, embrac- --ing the curved rim tof the scroll-caniN.

A rapid rotary 'gnotion havin g been imparted to the grindstone, andthe' casing B, with its disk-Wheel, having heeninoved back a shortdistance by means ofthe screws d,a hinged door, m, in the said casin gis opened, and the large end of a saw-blade introduced into the openingandadjusted against an inclined rib, y, .on the periphery of thedisk-wheel,

small pins w w on the latter passing throughy holes in the blade, asseen in- Fig. 2. The

disk-Wheel is then turned in the direction of' thearrow, the saw therebydrawn through the opening and occupying a position between the casing Band the'wheel U, and when the latter has been turned until anotherinclined. rib, y, presents itself at the opening, another blade isadjusted to the Wheel in the manner described above. l

In' the present instance the wheel C is adapted to the reception of twoordinary saw- 'f blades.

TheV door is now closed. and secured, and the'casing B moved ,toward thegrindstone, a portion of which projects through an opening in the casingB and bears against the blades ou the disk-wheel, which is now slowlyturned in the direction of the arrow by hand or by power. As the shaft Drevolves, the

scroll-cam N, through the medium of the bellcrank lever M, link L, rodJ', lever K, and rod J, causes .the boxes I and l of 'thegrindstone-shaft to move to and fro in ontranydirections to each other,thereby moving-the grindstone laterally and causing it to assumediEerent angles, so that'it must of necessity' grind the saw-bladethinner at some parts .than at others.

The blades ol' hand-saws of the best class areinvariahly-xnade thickeronthetoothededge than at the' back, and are alsomade thicker at thelrgethan at the smaller endl of the blade.

The blade, Fig. 3, for instance, should be thickest at the joint 2 andthinnest at the point 3, the blade being thicker at 2 than itis at 5,Vand thicker at 4 than it is at 3. It will be evident that the flange tof the scroll-cam N may be sc curved, and that the grindstone may havesuch a movement imparted to it, that the sew-blade may be reduced to thedi sited taper and 'variation in thickness.

Tapering saw-blades have been heretofore ground by placing them onbeveled plates secured to a disk-wheel and subjecting them to the actionof a `grindstone which always revoI-ved'in the same plane. This planinvolved the necessity of changing the beveled `plates to suitdiiie'rent blades-an operation which caused much delay and tediousmanipulation.

In my improvement the lateral movementA of the grindstone can be readilychanged and adapted to different blades by a simple change of thescroll-cam' N.

It will bc evident that devices other than those shownmay be adopted forimparting a lateral motion to the grindstone from the shaft of thedisk-Wheel C. Iv therefore do not de sire to confine myself to thesystem of rods ,and levers herein described for obtaining such WitnessesHENRY HoWsoN, CHARLES HowsoN.

